A good enterprise-grade Wi-Fi 6 router fixes dead zones and handles a dozen heavy devices without breaking a sweat. If you buy the right one, you are paying once to solve your home internet problems for the next five to seven years instead of replacing a cheap box every eighteen months.
Tech brands usually drop new hardware in the spring and fall. If you wait for back-to-school sales or November shopping events, you can grab last year's flagship model at a steep discount while getting nearly identical performance to the brand new release.
Remember that the intro window is a deadline, not free money, and what happens if the balance is still there at the end is that you will get hit with high deferred interest charges on the remaining amount.